Base-controlled annulation of tryptamine-derived isocyanides with nitrile imines for access to polycyclic spiroindoline derivatives

An annulation reaction of tryptamine-derived isocyanides with hydrazonyl chlorides in the presence of bases was developed. Controlled by different bases, [1+ ​2+3] annulation and [1+ ​2+3]/[2 ​+ ​3] annulation cascade were realized. In the latter reaction, five new chemical bonds as well as three new heterocycles were formed in one step. It showed extremely high efficiency, relatively broad substrate scope, milder reaction conditions, good tolerance of functional groups and good chemoselectivity

Solution-Processed Small Molecule Donor/Acceptor Blends for Electrical Memory Devices with Fine-Tunable Storage Performance

To simplify the conventional donor–acceptor molecular scaffold design, we report the synthesis of two simple donor (TCz) and acceptor (PI) semiconductors via brief synthetic routes. The film formed from solution process through the simple blending of TCz and PI revealed a compacted, continuous, and smooth morphology. The optical and electrochemical properties of the blend films with various blend proportions were characterized by UV–vis absorption spectra and cyclic voltammograms. The as-fabricated ITO/TCz:PI/Al sandwiched devices exhibited both volatility and reversibility dually tunable electrical data storage performance as the blend ratio varying. From these observations we demonstrate a very simple but powerful strategy to obtain organic memory devices with good performance

Inkjet-Printed Quantum Dot Light-Emitting Diodes with an Air-Stable Hole Transport Material

High-efficiency quantum dot light-emitting diodes (QLEDs) were fabricated using inkjet printing with a novel cross-linkable hole transport material <i>N</i>,<i>N</i>′-(9,9′-spirobi­[fluorene]-2,7-diylbis­[4,1-phenylene])­bis­(<i>N</i>-phenyl-4′-vinyl-[1,1′-biphenyl]-4-amine) (SDTF). The cross-linked SDTF film has excellent solvent resistance, high thermal stability, and the highest occupied molecular orbital (HOMO) level of −5.54 eV. The inkjet-printed SDTF film is very smooth and uniform, with roughness as low as 0.37 nm, which is comparable with that of the spin-coated film (0.28 nm). The SDTF films stayed stable without any pinhole or grain even after 2 months in air. All-solution-processed QLEDs were fabricated; the maximum external quantum efficiency of 5.54% was achieved with the inkjet-printed SDTF in air, which is comparable to that of the spin-coated SDTF in a glove box (5.33%). Electrical stabilities of both spin-coated and inkjet-printed SDTF at the device level were also investigated and both showed a similar lifetime. The study demonstrated that SDTF is very promising as a printable hole transport material for making QLEDs using inkjet printing